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The CFM150S-B: Fanless power solution with baseplate-cooling Technology

09

Apr

#Technical Article#AC-DC Power Supply#Medical#Industrial/ITE#Baseplate-cooling Design

Apr 9, 2021

The CFM150S-B: Fanless power solution with baseplate-cooling Technology

Evolving Switching Power Supplies:

AC-DC switching power supplies are essential power source to all kinds of electronic products. With the advance of science and technology, the size of electronic products has become smaller and slimmer, which is convenient for portable use. Therefore, in order to adapt the trend, the design of the power supply must be continuously improved for higher efficiency and power density.

However, the higher power density would generate heat dissipation problem. How to solve the problem becomes a very important subject. In this case, Cincon has developed and introduced a series of products built-in with baseplate-cooling technology. Today we are taking the CFM150S-B, the 150W power supply, for example.

Advantages of CFM150S-B power supply:

The heat is usually generated by power components and magnetic components.

The design structure of CFM150S-B is PFC+LLC. This structure brings the benefits of higher performance of 94% efficiency, 150W output power and lower power waste. In addition, the output power of 150W is under fanless condition, which is a leading performance among all competing products. Generally, the competing products require a fan to reach to 150W output power.

The CFM150S-B has the latest safety approval of IEC/UL/EN 62368-1, and the EMS is also suitable for light/heavy industrial applications, increasing the flexibility of use. Furthermore, the structure is designed to meet IEC/EN 60335-1 for household appliances.

Advantages of Base Cooling Structure:

Taking a closer look at CFM150S-B, the way of heat dissipation is the improved type. In general, the power supply is mounted on the system case and the way of heat dissipation of competing products is let the heat go up, which is shown as Photo (1). This way would cause the temperature inside the customer’s application to increase. By contrast, Cincon optimizes the heat dissipation of CFM150S-B by directing the heat to the bottom which is the system’s case. It is shown as Photo (2). It indeed decreases the temperature inside the system.

The CFM150S-B: Fanless power solution with baseplate-cooling Technology

Photo (1)

The CFM150S-B: Fanless power solution with baseplate-cooling Technology

Photo (2)

The Baseplate-cooling Design Correlation:

Based on the previous paragraph, the user may know the advantage of baseplate-cooling method. To see more testing results, Cincon has made two further experiments:

Experiment 1:

Under the natural convection condition, the CFM150S-B is tested at input 115Vac and output 150W. The component temperature is listed as following:

MODEL CFM150S-B
Test Condition Natural convection
Output Power Po:150W
Ambient 50.°C
Buck Cap. 100.2°C
Output Cap.1 95.9°C
Output Cap.2 94.°C
EMI FILTER1 99.1°C
EMI CAP, 95.4°C
EMI FILTER2 106.1°C
PFC FILTER Inductance 104.7°C
PFC FILTER CAP. 96.4°C
PFC Inductance 105.°C
Transformer 106.6°C
Output SR MOS 110.2°C
LLC MOS 108.6°C
PFC MOS 113.9°C
PFC DIODE 114.7°C
BRIDGE DIODE 110.5°C

According to the table above, we may find out that under the natural convection condition, the CFM150-B is able to reach to the full load output 150W, and the listed components are still under the limit of the temperature. It is a leading performance in the power supply industry.

Experiment 2:

To take advantage of the baseplate-cooling technology, the CFM150S-B could be mounted on a larger case or metal plate to direct more heat and decrease more temperature. In the experiment 2, the CFM150S-B is mounted on an aluminum plate with the size of length 300mm, width 200mm, and thickness 2mm.

The CFM150S-B: Fanless power solution with baseplate-cooling Technology

It is tested at input 115Vac and output 150W. The component temperature is listed as following:

MODEL CFM150S-B
Test Condition Natural convection
Output Power Po:150W
Ambient 65.°C
Buck Cap. 92.7°C
Output Cap.1 92.5°C
Output Cap.2 96.°C
EMI FILTER1 97.°C
EMI CAP, 92.2°C
EMI FILTER2 100.9°C
PFC FILTER Inductance 97.7°C
PFC FILTER CAP. 91.3°C
PFC Inductance 98.6°C
Transformer 107.9°C
Output SR MOS 97.2°C
LLC MOS 91.4°C
PFC MOS 88.9°C
PFC DIODE 94.1°C
BRIDGE DIODE 92.7°C

According to the table above, under the natural convection condition, the ambient temperature limit at full load 150W could extend up to 65°C while the CFM150S-B is mounted on the aluminum plate. At the same time, the component temperature would be lower when we compare to that on the first table. It is the notable advantage of baseplate-cooling technology.

In general, the user must choose a 300W power supply to work under the same condition which is ambient temperature 65°C and 150 output power. The 300W power supply would cost more and the size would definitely be larger. In this case, the CFM150S-B seems to be a better option.

 

Conclusion:

For the high-power-density power supplies, the way of heat dissipation becomes very important subject. Cincon brings the baseplate-cooling technology to overcome the heat dissipation issue. In the power supply industry, a 2”x4” inches 150W power supply usually needs a fan to work at full load 150W. However, Cincon comes up with the fanless solution which is the baseplate-cooling concept to make the performance of the power supply even better. Now Cincon provides more baseplate-cooling AC-DC power supplies from 130W to 500W coming with either industrial safety approvals or medical approvals.

 

Product Category Page: The baseplate-cooling power supplies

Product Page: CFM150S Series

Contact sales@cincon.com.tw for more product info.

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